One Subnet - Multiple Sites

[muratg7777]

Hi,

We have a customer who has 6 locations. They are connected with metro ethernet (point to multipoint)

Their ip blocks are

10.0.10.0/24 Site 1 (Main Office)

10.0.20.0/24 Site 2

10.0.30.0/24 Site 3

10.0.40.0/24 Site 4

10.0.50.0/24 Site 5

10.0.60.0/24 Site 6

The customer uses static ip adresses. If a client from main office goes any sites they must be connected without a problem with the main office's ip address block

For example 10.0.10.24/24 goes to site 2 . He/she must connect the network and all sites without changing static ip address. They are limited users and they don't have privilage to change their ip addresses.

If I use 10.0.10.0 network on site 2 and nat users to 10.0.20.0 network, I can not use policies on firewall per client basics.
Is one-on-one static nat would be solution for this?

For example 10.0.10.24 will be natted to 10.0.20.24

any suggestions for this?  Can I use L3 switch for this configuration? If no nat is necassery.

All sites will use Main Office's internet connection

[Nagendra Kumar Nainar · Accepted solution]

Hi,

you may have to consider mobile IP feature. Below is the link for more details,

http://www.cisco.com/en/US/products/ps6590/products_white_paper09186a00800a3ca5.shtml

I beleive you may have to have proxy arp enabled on gateway routers.

HTH,

Nagendra

[muratg7777]

Can you give me a sample configuration for this?

The article have samples for 3 interfaces. I must do this on 1 interface. We have 2811 Routers.

interface Ethernet 0

 ip address 131.108.10.5 255.255.255.0 
 ip mobile arp 
!

interface Ethernet 1

 ip address 131.108.11.5 255.255.255.0

 ip mobile arp 

!

interface Ethernet 2

 ip address 131.108.12.5 255.255.255.0

 ip mobile arp 

This is the only configuration needed if I use static routing?? or dynamic routing must configured??? 

[Nagendra Kumar Nainar]

Hi,

You need to apply "ip mobile arp" under the LAN interface on which the mobile laptop will be moving to. Now redistribute the same into your IGP using "redistribute mobile metric <>".

HTH,

Nagendra